14.1 Special Characters: Inserting @ {} , \ #

‘@’ and curly braces are the basic special characters in
Texinfo. To insert these characters so they appear in text, you must
put an ‘@’ in front of these characters to prevent Texinfo from
misinterpreting them. Alphabetic commands are also provided.

The other characters (comma, backslash, hash) are special only in
restricted contexts, as explained in the respective sections.